I2C总线又称IIC总线，最主要的优点是其简单性和有效性。由于接口直接在组件之上，因此I2C总线占用的空间非常小，减少了电路板的空间和芯片管脚的数量，降低了互联成本。总线的长度可高达25英尺，并且能够以10Kbps的最大传输速率支持40个组件。I2C总线的另一个优点是，它支持多主控(multimastering)， 其中任何能够进行发送和接收的设备都可以成为主总线。一个主控能够控制信号的传输和时钟频率。当然，在任何时间点上只能有一个主控。这是at24c02的代码-I2C-bus also known as the IIC bus, the main advantage is its simplicity and effectiveness. The interface directly above the component, the I2C bus, a very small footprint, reducing board space and the number of chip pins, reducing interconnection costs. The length of the bus up to 25 feet, and able to support the maximum transfer rate of 10Kbps to 40 components. Another advantage of I2C bus is that it supports multi-master (multimastering), any of them can be sending and receiving devices can become a main bus. A master can control the signal transmission and clock frequency. Of course, at any point in time only one master. This is the code at24c02